Brane Universes with Gauss-Bonnet-Induced-Gravity

Details Brane Universes with Gauss-Bonnet-Induced-Gravity Brane Universes with Gauss-Bonnet-Induced-Gravity

2006-02-13

arxiv.org/abs/gr-qc/0602050v2

Gen.Rel.Grav.39:477-500,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, 19 figures. Minor modifications to text, comments on phantom behaviour added. References added. As submitted to JCAP

Scientific paper

10.1007/s10714-007-0398-2

The DGP brane world model allows us to get the observed late time acceleration via modified gravity, without the need for a ``dark energy'' field. This can then be generalised by the inclusion of high energy terms, in the form of a Gauss-Bonnet bulk. This is the basis of the Gauss-Bonnet-Induced-Gravity (GBIG) model explored here with both early and late time modifications to the cosmological evolution. Recently the simplest GBIG models (Minkowski bulk and no brane tension) have been analysed. Two of the three possible branches in these models start with a finite density ``Big-Bang'' and with late time acceleration. Here we present a comprehensive analysis of more general models where we include a bulk cosmological constant and brane tension. We show that by including these factors it is possible to have late time phantom behaviour.

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